There are a few causes. The website indicated in Ethan’s note has good information. I was instructed to use Lotrimin.

Hi @lloyd12345, As @LMH963 mentioned, Ethan provided a good article about balanitis above. Here's another one from Harvard Medical
- Balanitis https://www.health.harvard.edu/a_to_z/balanitis-a-to-z

Excerpt:
"Balanitis is an infection or inflammation of the skin on the head (glans) of the penis. ...
A variety of infections and skin conditions can cause balanitis. These include:
- Infections with yeast (Candida) or bacteria that live on the skin (the most common cause)
- Sexually transmitted infections, such as herpes simplex
- Irritation of the skin by soap, detergents or spermicidal jelly
- Benign (noncancerous) skin conditions such as psoriasis
- Some types of skin cancer (very rare)

Treatment depends on the cause."

Have you discussed this with you medical provider?