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Hi there,I am an experienced Medical Specialist.I am here to address your concerns and provide great service.Please post a pic of the concerned area to provide your with precise diagnosis and treatment plan.
This does look like a blood blister --may have grown from irritation.
In that case, the size will shrink in next 2-3 weeks.
However, if it continues to grow, you will need further evaluation.
not likely given that this is not a solid nodule.