Thanks for the query.
This can be a condition called as autoimmune progesterone dermatitis
to rule out you need to get a patch test
with progesterone done.
The second possibility is shingles.
as ovulation is a stress
to body, recurrent shingles
a photograph would have helped in diagnosis.
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.