Milia. A milium is a white papule, 1–2 mm in size, composed of laminated, keratinous material and situated as a solid cyst in a pilosebaceous follicle. Milia are fairly common on the brow, glabella, and nose in newborn infants and in such infants tend to disappear quickly and spontaneously. There may be few or many, and they may develop later in infancy, in childhood, and in adolescence. In older children and adolescents, they tend to macules may be sparse or numerous and resolve without residua over a period of several weeks to several months.
Onycholysis (drug-induced). This word means separation (-lysis) of nails (onycho-) from nail beds. There are many causes for such a development. The commonest are mechanical. Nails worn long are frequently lifted by being snagged. Excessive soaping and soaking in heavy housework promote separation. The illustration here is of another cause, namely, an idiopathic response by photosensitivity in a patient who had been taking demethylchlortetracycline. Doxycycline also does this.
Nickel contact dermatitis. Allergy to nickel is one of the most common causes of contact dermatitis in children. Infants may present with skin lesions corresponding to the location of snaps on their pajamas or other garments. Older children may show reactions to watches, chains, belt buckles, or earrings.