Chin dimpling
back to main page
Chin dimpling is an uneven, puckered skin surface in the central part of the chin, also referred to as cobblestone chin, pebbled chin, or "orange peel" on the chin. It most commonly appears during the contraction of the mentalis muscle (musculus mentalis), whose fibers attach directly to the skin. Their contraction elevates the chin tissues, protrudes the lower lip, and pulls the skin inward at specific points, creating numerous small depressions. The condition is usually aesthetic rather than pathological; however, it can be exacerbated by malocclusion, mandibular retrusion, incomplete lip closure, or aging processes. Dynamic dimpling, visible mainly during speaking and facial expressions, must be distinguished from permanent skin irregularities and a congenital median chin furrow.
Chin dimpling - what it looks like
The typical presentation includes numerous small dimples and bumps that give the chin skin a texture resembling cobblestones or an orange peel. The irregularities may appear symmetrically on both sides of the midline or be more pronounced on one side. They are often accompanied by:
- a horizontal, deepened labiomental crease,
- apparent shortening of the chin during muscle contraction,
- elevation and protrusion of the lower lip,
- tension of the tissues beneath the lower lip,
- difficulty in effortlessly keeping the lips closed,
- asymmetry appearing during speaking, pursing the lips, or expressing emotions.
Distinguishing between dynamic and static dimpling is of fundamental importance. The dynamic form is visible primarily during mentalis muscle activity, whereas at rest, the skin remains relatively smooth. In the static form, irregularities persist even without conscious muscle contraction. This may indicate permanent changes in the skin, subcutaneous tissue atrophy, a reduction in collagen, or long-term, increased muscle tone.
Chin dimpling is not the same as a single chin dimple or a midline groove. A congenital dimple is usually related to the formation of the soft tissues, the mentalis muscle, and sometimes also the bony contour of the mandible. It has a fixed location and may be visible regardless of facial expressions. A cobblestone chin, on the other hand, creates numerous, variable dimples dependent on muscle contraction.
Clinical evaluation should include the appearance of the chin at rest, during speaking, smiling, pursing the lips, and gently closing them. The physician also analyzes the facial profile, mandibular position, bite, lower lip symmetry, and skin quality.
Chin dimpling - why does it happen
The direct cause is most often excessive or compensatory activity of the mentalis muscle. It is a paired facial expression muscle originating in the anterior part of the mandible, below the incisors, and terminating with fibers in the skin of the chin. Its contraction elevates the soft tissues of the chin and protrudes the lower lip. Superficial fibers attached to the skin cause pinpoint dimpling of its surface.
Increased muscle tone may result from several mechanisms:
- individual anatomical structure, including the distribution of muscle fibers and their connections to the skin;
- habitual clenching or protruding of the lips;
- incomplete lip closure, known as lip incompetence;
- mouth breathing;
- mandibular retrusion or insufficient chin projection;
- malocclusions, especially increased overbite or overjet;
- compensatory muscle work during swallowing and articulation;
- facial muscle asymmetry, and occasionally impaired innervation.
If the lips do not meet effortlessly when the mandible is in a normal position, the mentalis muscle may be engaged to force the oral fissure closed. In such cases, dimpling is a symptom of a compensatory mechanism rather than solely a local skin change. An aesthetic procedure alone does not address the underlying orthodontic or skeletal cause.
Aging also plays a significant role. The loss of collagen, elastin, and subcutaneous adipose tissue reduces the skin's resistance to repetitive deformation. Initially dynamic indentations may gradually progress into irregularities visible even at rest. In some individuals, this appearance is exacerbated by insufficient bony chin projection or the loss of soft tissue support.
The sudden onset of chin asymmetry, tremors, uncontrolled spasms, or weakness of the lower lip requires medical diagnosis. Such symptoms do not correspond to typical, isolated aesthetic dimpling.
Chin dimpling - does it worsen when speaking
Chin dimpling can worsen while speaking because articulation requires the precise coordination of the mandible, tongue, lips, and lower facial muscles. The mentalis muscle is involved in elevating the chin tissues and protruding the lower lip; therefore, its activity increases during the pronunciation of certain sounds, pressing the lips together, and performing movements that require lip closure.
Exacerbation of these changes while speaking is particularly likely in individuals with:
- lip incompetence,
- mandibular retrusion or a poorly defined chin,
- increased overjet,
- an abnormal swallowing pattern,
- mouth breathing,
- habitual tension of the lower face.
Under such conditions, the mentalis muscle acts compensatorily, helping to stabilize the lower lip or close the mouth. The greater the effort this action requires, the more visible the skin depressions may become.
Observing the chin solely at rest is not sufficient for a complete assessment of the problem. Dynamic examination includes casual conversation, pronouncing labial sounds, smiling, holding air in the oral cavity, and gently bringing the lips together without clenching. A short video recording taken from the front and profile can be helpful.
If dimpling is present primarily while speaking, it indicates a dominant muscular involvement. Irregularities persisting at rest, on the other hand, indicate a structural component involving the skin, subcutaneous tissue, or chin anatomy. Identifying the mechanism is essential for selecting the appropriate therapy. Excessive weakening of the mentalis muscle could impair lower lip stabilization, speech, drinking, or effortless lip closure.
Chin dimpling - how to smooth it
The approach depends on whether muscle hyperactivity, established skin changes, insufficient chin projection, or a malocclusion predominates. Before the procedure, the physician should assess facial expressions, lip seal, facial profile, and the position of adjacent muscles of the lower face.
Botulinum toxin type A is the primary method for reducing dynamic dimpling. It inhibits the release of acetylcholine at the neuromuscular junction, temporarily reducing the contraction strength of the mentalis muscle. At Ambasada Urody, classic botulinum toxin treatments for chin wrinkles, facial feature lifting with botulinum toxin, and mesobotox used, among others, for an uneven chin surface are available. Classic intramuscular administration acts directly on muscle hyperactivity. Mesobotox, utilizing more superficial injections, can be considered for minor irregularities, but it does not replace the precise treatment of severe muscle hyperactivity.
The effect of the toxin is temporary. Incorrect placement, depth, or excessive dose may cause smile asymmetry, lower lip drooping, and difficulty closing the mouth, speaking, or drinking. This results from the close proximity of the depressor labii inferioris and orbicularis oris muscles.
With a coexisting projection deficiency, chin modeling with hyaluronic acid or profiloplasty can be considered. At Ambasada Urody, tissue stimulators are also available, including preparations based on calcium hydroxyapatite and polylactic acid. These methods can improve tissue support and quality, but they do not eliminate excessive muscle contraction.
In the case of established skin irregularities, complementary therapies available at the clinic may include:
- DeAge EX 3D or Pixel RF microneedle radiofrequency,
- non-invasive radiofrequency, including Reaction RF, Pellevé RF, and Alma Accent,
- Zaffiro thermolifting,
- fractional laser therapy,
- needle, collagen, or polynucleotide mesotherapy, or platelet-rich plasma.
Skin remodeling procedures improve its density and structure, but do not treat the primary muscle hyperactivity. HIFU SonoQueen and lifting threads are primarily relevant in the presence of coexisting lower face laxity, rather than in isolated dimpling. Malocclusions and lip incompetence require orthodontic consultation, while significant skeletal disorders may require surgical treatment.
