Povidone iodine ( Betadine) alao called Equate First Aid Antiseptic at Walmart in the first aid aisle would be a good antiseptic and could help to dry it out. Is there blistering under the lesions? Hopefully, others will share if they have seen this deformity before.
Dollar General Store, if you're lucky enough to be in an area they are, will have their own brand of iodine, and it will be cheaper than anywhere else, if that's the medication you choose to use.