How Much Would It Cost to Remove a Mole on the Underside of the Penis?

First, I would recommend that you have the lesion examined by a physician, preferably a dermatologist. If the lesion is concerning enough, it will be biopsied and sent to a lab for microscopic analysis. This would be covered by insurance if it requires testing. If this is being done only for cosmetic purposes, then the cost would be approximately $300-$400 assuming it is a small lesion. Larger lesions would naturally be more costly. But do have it examined if you are concerned at all about it.

With out an examination and determining the exact diagnosis and the size and type of excision one can not give an advise. See a plastic surgeon for that.. Cost is important, but a proper diagnosis and discussion of the plan of treatment and risks are important to understand.

The cost of a single mole removal is usually a few hundred dollars, at most. But it's important to get an evaluation of any site that is growing or changing in any way for proper diagnosis and assessment."This answer has been solicited without seeing this patient and cannot
be held as true medical advice, but only opinion. Seek in-person
treatment with a trained medical professional for appropriate care."