Milia Underlying Cause
The milia rash is caused by collections of protein in the hair follicles or sweat glands. This may occur in infants, who have underdeveloped sweat glands, or in adults.
Causes of milia in adults include:
- Johr RH, Schachner LA. Neonatal dermatologic challenges. Pediatr Rev 1997 Mar; 18(3): 86-94. 
- Langley RG, Walsh NM, Ross JB. Multiple eruptive milia: report of a case, review of the literature, and a classification. J Am Acad Dermatol. 1997 Aug;37(2 Pt 2):353-6. 
- Mallory SB. Neonatal skin disorders. Pediatr Clin North Am 1991 Aug; 38(4): 745-61.