Tinea manuum is a fungal infection of the hand, mostly a type of dermatophytosis, often part of two feet-one hand syndrome. There is diffuse scaling on the palms or back of usually one hand and the palmer creases appear more prominent. When both hands are affected, the rash looks different on each hand, with palmer creases appearing whitish if the infection has been present for a long time. It can be itchy and look slightly raised. Nails may also be affected.

The most common cause is Trichophyton rubrum. The infection can result from touching another area of the body with a fungal infection such as athletes foot or fungal infection of groin, contact with an infected person or animal, or from contact with soil or contaminated towels. Risk factors include diabetes, high blood pressure, weak immune system, humid surroundings, excessive sweating, recurrent hand trauma and cracks in feet. Pet owners and farmworkers are also at higher risk. Machine operators, mechanics, gas/electricity workers and people who work with chemicals have also been reported to be at greater risk.

Diagnosis is by visualization, direct microscopy and culture. Psoriasis of the palms, pompholyx and contact dermatitis may appear similar. Treatment is usually with long-term topical antifungal medications. If not resolving, terbinafine or itraconazole taken by mouth might be options.

It occurs worldwide. One large study revealed around 84% of tinea manuum was associated with athletes foot, of which 80% admitted scratching their feet, and 60% were male,