Thanks for the query.shingles
is almost always unilateral.
he might be suffering from a fungal infection
Another possibility is frictional dermatitis
A biopsy may be needed to differentiate this.
Please meet a dermatologist
and discuss regarding this.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.