Introduction:
Processes, characterized by increased or decreased melanin pigmentation.
Clinical signs:
Pictures
Vitiligo, neck:
Vitiligo, CLINIC (944)
Vitiligo, eyelids:
Vitiligo, CLINIC (945)
Vitiligo, feet:
Vitiligo, CLINIC (1921)
Vitiligo, hands:
Vitiligo, CLINIC (946)
Vitiligo, trunk:
Vitiligo, CLINIC (947)
Large vitiligo, trunk:
Vitiligo, CLINIC (3437)
Vitiligo, CLINIC (3438)
Vitiligo:
Vitiligo, CLINIC (3440)
Vitiligo, hands and fingers:
Vitiligo, CLINIC (3441)
Vitiligo, CLINIC (3442)
Vitiligo, CLINIC (3432)
Vitiligo, CLINIC (3433)
Vitiligo, elbows:
Vitiligo, CLINIC (3434)
Vitiligo, forearms:
Vitiligo, CLINIC (3435)
Vitiligo:
Vitiligo, CLINIC (5944)
Vitiligo, perianal and perigenital:
Vitiligo, CLINIC (3431)
Vitiligo, CLINIC (3436)
Segmental vitiligo:
Vitiligo segmentalis, CLINIC (5945)
Hypopigmentations after herpes zoster:
Herpes zoster, residual hypopigmentations, CLINIC (5656)
Herpes zoster, residual hypopigmentations, CLINIC (5657)
Acrofacial vitiligo:
Vitiligo, acrofacial form, CLINIC (6379)
Vitiligo, CLINIC (6378)
Histology:
The number of melanocytes within the epidermis is decreased or there are no melanocytes at all. Variable lymphocytic infiltration, usually mild and often none.
Pictures
Vitiligo:
Vitiligo, HE 40x (4040)
Vitiligo, Fontana Masson 40x (4041)
Vitiligo, HE, Masson:
Vitiligo, HE 60x (13863)
Vitiligo, Fontana Masson 60x (13864)
Vitiligo, HE, Masson:
Vitiligo, HE 60x (13973)
Vitiligo, Fontana Masson 60x (13974)
Clinical signs:
Histology:
Inconspicuous; Fontana-Masson staining reveals pigment reduction; the number of melanocytes is decreased.
Pictures
Hypomelanosis guttata:
Hypomelanosis guttata, HE 20x (1340)
Hypomelanosis guttata, Fontana Masson 20x (1341)
Clinical signs:
Pictures
Pityriasis alba:
Tinea versicolor alba, CLINIC (3243)
Tinea versicolor alba, CLINIC (3244)
Tinea versicolor alba, CLINIC (3245)
Tinea versicolor alba, CLINIC (3246)
Histology:
The signs are inconstant: mild hyperkeratosis, parakeratosis, spongiosis. Melanocytes are normal, the amount of melanin is reduced.
Pictures
Pityriasis alba:
Pityriasis alba, HE 40x (6238)
Pityriasis alba:
Pityriasis alba, HE 40x (6239)
Clinical signs:
Clinical signs:
Pictures
Histology:
Hyperpigmented basal layer of the epidermis with slightly increased number of melanocytes. Some pigment is present within the papillary dermis as well (free pigment, scattered melanophages).
Pictures
Melasma:
Melasma, HE 40x (2301)
Clinical signs:
Pictures
Ephelides (frecles):
Ephelis, CLINIC (2891)
Histology:
Hyperpigmentation of the epidermal basal layer; number of melanocytes is normal.
Clinical signs:
Histology:
Acanthosis, dendritic melanocytes, increased pigmentation of the basal layer of the epidermis. Melanophages are scattered in the papillary dermis in about half of cases.
Pictures
Melanocytic macule of the lip (labial lentigo):
Melanotic macule of the lip, HE 40x (4052)
Melanocytic macule of the lip, another case:
Melanotic macule of the lip, HE 40x (2300)
Genital lentigo:
Genital lentigo, HE 20x (4263)
Clinical signs:
Histology:
Hyperpigmentation of the basal layer, the number of melanocytes is normal or slightly increased.
Pictures
Dowling-Degos disease, pigmentary incontinence:
Dowling-Degos disease, HE 10x (1258)
Dowling-Degos disease, HE 20x (1259)
Another case:
Dowling-Degos disease, HE 20x (4469)
Clinical signs:
Etiology:
Sensoric disorder accompanying degenerative disease of the spine with pruritus.
Histology:
Melanophages in the papillary corium similar to postinflammatory changes. Clinical data are necessary.
Pictures
Notalgia paresthetica:
Notalgia paresthetica, HE 60x (14067)
Clinical signs:
Etiology:
Histology:
Vacuolar degeneration, epidermal atrophy, melanophages scattered in the upper dermis.
Pictures
Melanodermatitis toxica:
Melanodermatitis toxica, HE 20x (4806)
Clinical signs:
For details see special literature.
Pictures
Pigment incontinence, third stage:
Incontinentia pigmenti, third stage, HE 40x (4737) [zoomify]
Clinical signs:
Pictures
Nevus achromicus:
Nevus achromicus, CLINIC (3140)
Nevus achromicus, CLINIC (3141)
Nevus achromicus, CLINIC (3142)
Histology:
Normal or slightly reduced melanocytes.