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Since the fluid that comes out of the blister
is clear, there is no infection. It is just a blister containing clear fluid due to blockage of gland.
Take special care to retract your foreskin completely, during bathing and wash your penis and underside of the head of the penis with soap and water.
Regular washing of the penis thoroughly will clear these blisters and the dirt that collects on underside of the rim of the head of the penis.