There appears to be some disagreement on whether cortisone should be used if you have a fungal infection. The American Osteopathic College of Dermatology (AOCD) says that cortisone cream should not be put on a fungal infection because it can cause the fungus to grow.
At first cortisone may appear to be working. The rash may itch less and the inflammation and redness may fade a bit. However, the rash will spread and recur and become itchier than ever when you stop applying cortisone, according to the AOCD.
Bodyandhealth.canada.com reports that cortisone should not be used by anyone who has an internal fungal infection. Healthopedia.com concurs that you should not use cortisone if you have a fungal infection because it may make your infection worse.
If you use cortisone this can change the normal acidic-alkali balance of the skin’s surface, which makes the skin less able to resist fungal infections, according to Herbs2000.com, and, in fact, can increase the likelihood of acquiring a fungal infection or making one recur.
On the other hand, the Mayo Clinic recommends using Betamethasone, which is a corticosteroid or cortisone-like medicine or steroid to treat fungal infections including ringworn, jock itch and athlete’s foot, noting that this is an effective means of combating a fungal infection.
The Mayo Clinic does note that there are risks to taking this medication, as is the case with many medicines.