Diffuse cutaneous mastocytosis

What it is

From: Orphanet

Diffuse cutaneous mastocytosis (DCM) is a rare form of cutaneous mastocytosis (CM) characterized by generalized erythroderma, various degrees of blistering, skin with a ''peau d'orange'' appearance and the accumulation of mast cells in the skin. At least two DCM variants are recognized, one with extreme blistering (Bullous DCM) and one with infiltrations (Pseudoxanthomatous DCM).

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.

Flushing · Very frequent (99-80%)

Recurrent episodes of redness of the skin together with a sensation of warmth or burning of the affected areas of skin.

Generalized abnormality of skin · Very frequent (99-80%)

An abnormality of the skin that is not localized to any one particular region.

Increased serum mast cell beta-tryptase concentration · Very frequent (99-80%)

An abnormally elevated concentration of total tryptase (alpha and beta tryptase) in the blood circulation.

Pruritus · Very frequent (99-80%)

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.

Abnormal blistering of the skin · Frequent (79-30%)

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

Anaphylactic shock · Frequent (79-30%)

An acute hypersensitivity reaction due to exposure to a previously encountered antigen.

Diarrhea · Frequent (79-30%)

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

Headache · Frequent (79-30%)

Cephalgia, or pain sensed in various parts of the head, not confined to the area of distribution of any nerve.

Hypotension · Frequent (79-30%)

Low Blood Pressure, vascular hypotension.

Lymphocytosis · Frequent (79-30%)

Increase in the number or proportion of lymphocytes in the blood.

Malnutrition · Frequent (79-30%)

A deficiency in the intake of energy and nutrients.

Skin erosion · Frequent (79-30%)

A discontinuity of the skin exhibiting incomplete loss of the epidermis, a lesion that is moist, circumscribed, and usually depressed.

Thickened skin · Frequent (79-30%)

Laminar thickening of skin.

Other findings in the same source

From: Orphanet

Additional reported features include Urticaria (Frequent (79-30%)); Vomiting (Frequent (79-30%)); Peau d'orange (Frequent (79-30%)); Abdominal pain (Occasional (29-5%)); Abnormality of the liver (Occasional (29-5%)); Dermatographic urticaria (Occasional (29-5%)); Erythroderma (Occasional (29-5%)); Fever (Occasional (29-5%)); Gastrointestinal hemorrhage (Occasional (29-5%)); Hepatomegaly (Occasional (29-5%)). This is a selected summary, not a complete description of the condition.

When it may begin

From: Orphanet

Infancy; Neonatal

Inheritance in the source

From: Orphanet

Not applicable

Frequency and the population described

From: Orphanet

Reported case(s): 30.0; Worldwide. This is a published case count, not prevalence. Point prevalence: <1 / 1 000 000; Worldwide; Class only.

Which doctor should you see?

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

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 Diffuse cutaneous mastocytosis. 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.