Types The two different kinds of<unk>  are epidermal and dermal. *Epidermal<unk>  results from melanin pigment that is elevated in the suprabasal layers of the epidermis. *Dermal<unk>  occurs when the dermal macrophages have an elevated melanin level.<unk>  is usually diagnosed visually or with assistance of a Wood's lamp (340 - 400 nm wavelength). Under Wood's lamp, excess melanin in the epidermis can be distinguished from that of the dermis. This is done by looking at how dark the<unk>  appears; dermal<unk>  appears darker than epidermal<unk>  under the Wood's lamp. Severity The severity of facial<unk>  may be assessed by colorimetry, mexametry, and the<unk>  area and severity index (MASI) score. Differential diagnoses<unk>  should be differentiated from freckles, solar lentigo, toxic melanoderma, Riehl's melanosis, post-inflammatory hyperpigmentation, friction melanosis, ochronosis (endogenous and exogenous), cutaneous erythematosus lupus. Additionally, it should not be confused with phytophotodermatosis, pellagra, endogenous phototoxicity, nevus of Ota, café au lait macules, seborrheic keratosis, Civatte's poikiloderma, acquired bilateral nevus of ota-like macules (Hori's nevus), periorbital hyperpigmentation, erythrose pigmentaire peribuccale of Brocq, erythromelanosis follicularis faciei, facial acanthosis nigricans, and actinic lichen planus. Also, cases of drug-induced pigmentation have been reported, caused by amiodarone, or hydroquinone-induced exogenous ochronosis (see ochronosis treatment)
Melasma
Tar melanosis
Xanthelasma
Ichthyosis
Pomade acne
Feline acne
Melanosis
Erythrasma