Meyerson-naevus L30.8

Meyerson 1971

Spontaneously occurring, halo-shaped eczematous reaction around a melanocytic nevus, corresponding to the pigment-free halo nevus.

Unexplained, a Köbner phenomenon is discussed in the context of atopic eczema, pityriasis rosea or psoriasis vulgaris.

Predominantly occurring in middle-aged men.

Sudden, halo-shaped redness and scaling of most or all of a patient's melanocytic nevi in the form of a reddened, slightly scaly, 0.1- 1.0-cm-wide fringe. Occurrence usually in summer. Such (isomorphic irritant) effects are also observed in seborrheic keratoses, e.g. in psoriasis vulgaris (Meyerson phenomenon).

Enforcing the melanocyte nests with an infiltrate containing numerous eosinophil granulocytes. In the marginal area epidermal changes in the form of parakeratosis, spongiosis, acanthosis as well as epidermotropy of leucocytes.

Halo-nevus.

Mild antiecematous local therapy, e.g. with 1% hydrocortisone in Vaseline. Later excision.

Spontaneous regression tendency of eczema. The melanocytic nevi always remain unchanged.

Over time, cases of "eczematous" or even psoriatic reactions have been described around basal cell carcinomas, spinocellular carcinomas, dermatofibromas, seborrheic keratoses and nevi flammei, so that the generalizing name "Meyerson phenomenon" has become established.

1. Wall A, Disciple H (1991) Halo dermatitis around naevuscellnaevi (Meyer- son-Naevi). Act Dermatol 17: 22-24
2. Nicholl's DSH, Mason GH (1988) Halodermatitis around a melanocytic naevus: Meyerson's naevus. Br J Dermatol 118: 125-129
3. Hofer T (2002): Meyerson-Naevus as primary medallion of a pityriasis rosea. Gibert. dermatologist 53: 338-341
4. Meyerson LB (1971) Peculiar papulous squamous eruption involving pigmentet naevi. Arch Dermatol 103: 510-512
5. Simopn V et al (2011) Eczema disguises a naevus flammeus - the Meyerson phenomenon. JDDG 9: 305-307