It usually occurs within days of having chemotherapy or within days of taking certain medications.

This could be an allergic reaction and may warrant medical attention right away.

Treatments

While chemo rash may be similar in appearance to regular acne, it is treated differently.

Man washing his face with tap water

Thierry Lord / Moment / Getty Images

The first step in treating your chemo acne during cancer treatment is to discuss it with your healthcare provider.

Over-the-counter products may also be sufficient.

2013;30(3):195-198. doi:10.5114/pdia.2013.35624

American Cancer Society.Targeted therapy side effects.

American Academy of Dermatology Association.How to care for your skin before and after radiation therapy.