Is a water blister identified as birthmark for a 5 month baby any concern ?
Patient: Our five month old baby seems to have a water blister (fairly large) on what our pediatrician identified as a birth mark just inside her elbow (about a half inch long and a bit darker than the skin surrounding).  Wondering what might cause it, or if it is something to be concerned about? Doctor: hi, water blister is not a birthmark. Birthmark are usually hyperpigmented or hypopigmented patches on skin. But it is never associated with looks of water blister. You should get the child examined by skin specialist doctor. Take care.