ABSTRACT
Numerous dermatoses can be exacerbated by sunlight but cannot be classified into a simple category. They can be classified into autoimmune diseases, genodermatoses, infectious diseases, nutritional deficiencies, neoplasms, and primary dermatologic diseases. Pemphigus comprises a group of diseases characterized histologically by acantholysis of the epidermis. In pemphigus foliaceous, the level of acantholysis is through the stratum granulosum. Pyridoxine is necessary for the endogenous synthesis of nicotinic acid from tryptophan. Hydroa aestivale and hydroa vacciniforme are thought to be the same disease, with the former being a less severe, nonscarring form of the latter. Transient acantholytic dermatosis is a disease of middle-aged and elderly men in whom discrete, pruritic, edematous papules or papulovesicles appear, most frequently on the chest and back. Disseminated superficial actinic porkeratosis presents in adult white patients with an average age of 36. Lichen planus actinicus is seen in Middle Eastern countries on the sun-exposed areas of dark-skinned people ages 21– 30.
