) and lobular compartments, which differ in microscopic appearance.[8] Functionally, the subcutaneous fat insulates the body, absorbs trauma, and serves as a reserve energy source.[14]Conditions of the human integumentary system constitute a broad spectrum of diseases, also known as dermatoses, as well as many nonpathologic states (like, in certain circumstances, melanonychia and racquet nails).[15][16] While , shave bumps) * Pseudopelade of Brocq (alopecia cicatrisata) * Psoriatic nails * Pterygium inversum unguis (pterygium inversus unguis, ventral pterygium) * Pterygium unguis (dorsal pterygium) * Purpura of the nail bed * Racquet nail (brachyonychia, nail en raquette, racquet thumb) * Recurrent palmoplantar hidradenitis (idiopathic palmoplantar hidradenitis, idiopathic plantar hidradenitis, painful