It seems that your husband may be having skin tag near anus.
It is also called achrocordon. There is a hypertrophy of dermal tissues causing overgrowth.. It may cause mild itching or uneasy sensation as it is near anus.
You consult dermatologist
. After few blood tests, he may excise the growth under local anaesthesia. It is an OPD procedure.
I feel he may be alright after minor surgery.
I hope you got my answer.
Dr. Ilyas Patel MD