Cutaneous mastocytoma

What it is

From: Orphanet

Cutaneous mastocytoma is a form of cutaneous mastocytosis (CM) generally characterized by the presence of a solitary or multiple hyperpigmented macules, plaques or nodules associated with abnormal accumulation of mast cells in the skin.

Reported clinical features and what the terms mean

The following findings are associated with this condition in Orphanet. They are not a checklist for diagnosing yourself, and they do not all occur in every affected person. Some are examination, imaging or laboratory findings that cannot be recognised at home.

The frequency labels describe how often a finding was reported among people with the condition in the source. They do not give the chance that a person with that symptom has the condition. Definitions below reproduce HPO terminology; they explain the term, not the likely severity in an individual.

Darier's sign · Very frequent (99-80%)

A skin change elicited by briskly rubbing the skin lesion in urticaria pigmentosa (UP), whereby the area begins to itch and becomes raised and surrounded by erythema. Unlike other forms of dermatographism, Darier's sign refers to urtication that is limited to the UP involved areas and, as in this case, spares the skin unaffected by UP.

Diarrhea · Frequent (79-30%)

Abnormally increased frequency (usually defined as three or more) loose or watery bowel movements a day.

Erythematous papule · Frequent (79-30%)

A circumscribed, solid elevation of skin with no visible fluid that is reddish (erythematous) in color.

Hypermelanotic macule · Frequent (79-30%)

A hyperpigmented circumscribed area of change in normal skin color without elevation or depression of any size.

Hyperpigmented papule · Frequent (79-30%)

A papule (circumscribed, solid elevation of skin with no visible fluid, varying in size from a pinhead to less than 10mm in diameter at the widest point) that exhibits increased pigmentation (is darker) compared to the surrounding skin.

Macule · Frequent (79-30%)

A flat, distinct, discolored area of skin less than 1 cm wide that does not involve any change in the thickness or texture of the skin.

Maculopapular exanthema · Frequent (79-30%)

A skin rash that is characterized by diffuse cutaneous erythema with areas of skin elevation. It may evolve to vesicles or papules as part of a more severe clinical entity. Different degrees of angioedema with involvement of subcutaneous tissue may also appear.

Pruritus · Frequent (79-30%)

Pruritus is an itch or a sensation that makes a person want to scratch. This term refers to an abnormally increased disposition to experience pruritus.

Skin nodule · Frequent (79-30%)

Morphologically similar to a papule, but greater than either 10mm in both width and depth, and most frequently centered in the dermis or subcutaneous fat.

Skin plaque · Frequent (79-30%)

A plaque is a solid, raised, plateau-like (flat-topped) lesion greater than 1 cm in diameter.

Peau d'orange · Frequent (79-30%)

Abdominal pain · Occasional (29-5%)

An unpleasant sensation characterized by physical discomfort (such as pricking, throbbing, or aching) and perceived to originate in the abdomen.

Abnormal blistering of the skin · Occasional (29-5%)

The presence of one or more bullae on the skin, defined as fluid-filled blisters more than 5 mm in diameter with thin walls.

Dyspnea · Occasional (29-5%)

Difficult or labored breathing. Dyspnea is a subjective feeling only the patient can rate, e.g., on a Borg scale.

Other findings in the same source

From: Orphanet

Additional reported features include Erythema (Occasional (29-5%)); Flushing (Occasional (29-5%)); Headache (Occasional (29-5%)); Hyperpigmentation of the skin (Occasional (29-5%)); Hypotension (Occasional (29-5%)); Increased serum mast cell beta-tryptase concentration (Occasional (29-5%)); Nausea (Occasional (29-5%)); Scaling skin (Occasional (29-5%)); Skin erosion (Occasional (29-5%)); Telangiectasia of the skin (Occasional (29-5%)). This is a selected summary, not a complete description of the condition.

When it may begin

From: Orphanet

All ages

Inheritance in the source

From: Orphanet

Not applicable

Which doctor should you see?

The suggested department for discussing Cutaneous mastocytoma is Dermatology, with a dermatologist as the relevant type of clinician. Dermatologist; paediatric services for children as appropriate.

Additional services that may be relevant, depending on the findings, include: Clinical Genetics.

This is an editorial referral starting point. The appropriate clinic depends on the person’s age, symptoms, previous diagnosis and local services. The first clinician can decide whether another specialty or a team is needed; a department label does not confirm the diagnosis.

How to prepare for an assessment

Bring a short timeline of the main symptoms: when they first appeared, whether they are constant or episodic, what seems to change them, and how they affect daily activities. Include previous reports, discharge summaries, current medicines and supplements, allergies, and any relevant family history. A dated record is more useful than trying to match every feature in an online article.

Ask the clinician what is already established and what remains uncertain. If a test is suggested, ask what question it answers, what its limitations are and how the result would change the next step. The information here is not an instruction to arrange every possible test. In children, bring growth, developmental and school information if it is relevant to the concern.

• Which features of the skin, hair or nails distinguish the possibilities?
• Would photographs over time help document the changes?
• What should be expected from treatment, and how will irritation or other adverse effects be managed?

Treatment discussions and follow-up

The material gathered for this draft does not provide a complete condition-specific treatment pathway for Cutaneous mastocytoma. That gap does not mean that treatment is unavailable. A clinician needs to establish the diagnosis and review current guidance before recommending medicines, procedures, rehabilitation or other support.

Before leaving the appointment, clarify the next review date, who will communicate results, and whom to contact if the situation changes. Discuss difficulties with sleep, work, school, mobility, eating or emotional wellbeing when these are relevant. Practical support may require coordination between the treating clinician and other services.

The collected references do not establish a complete prevention or long-term outlook section for this entry. Missing information should not be interpreted as proof that prevention is impossible or that a particular outcome is inevitable. Ask what is known for the exact subtype, stage and personal circumstances, and which uncertainties remain.

When to seek emergency help

Severe breathing difficulty, collapse, new stroke-like symptoms, a seizure that is prolonged or repeated without recovery, uncontrolled major bleeding, or an immediate risk of self-harm require emergency help. In India, call 112 or reach the nearest emergency department. This is a general, non-exhaustive warning list; it is not a condition-specific triage tool.