Suction Blisters in an infant: Case report
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A full-term female infant was born via spontaneous vaginal delivery to a 30-year-old primigravida after an uncomplicated pregnancy. Physical examination results of the newborn following delivery revealed linear bullae on the dorsal aspect of all fingers and thumb on her left hand and a single blister on the left forearm. All bullae were filled with clear fluid. The remainder of the physical examination, including the rest of the skin and mucosae, was unremarkable. The child was breastfed and was observed to be sucking on the lesions. The bullae resolved spontaneously and healed without scarring by 8 days of life. No skin fragility, new blisters, or erosions were noted after resolution.

Sucking blisters are benign lesions present at birth and are the consequence of vigorous sucking by the infant in utero. They are not associated with other skin changes or congenital conditions. The incidence of sucking blisters is approximately 1 in 240 live births, and superficial vesicles/bullae are classically located on the radial forearm, wrist, and hand. Typically blisters vary in size from 0.5 cm to 2 cm, are oval in shape and thick-walled, and are filled with clear fluid.

The absence of inflammation, purulent discharge, and bullae in other body parts (particularly in areas prone to friction, including the diaper area) and the presence of lesions at birth, healthy appearance of the neonate, and spontaneous resolution of the bullae are all features that are suggestive of sucking blisters. Observation of the infant sucking on the lesions, such as in this case, can be helpful in making the diagnosis.

Source: https://jamanetwork.com/journals/jamadermatology/fullarticle/2770069
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