Most skin diseases may be prevented by

Report any skin lesions or sores to your coaching staff immediately (and parent or guardian if you are under 18 years of age).
Have rashes and sores evaluated by a medical provider before resuming practice or competition.
Wash your hands frequently or use an alcohol-based hand sanitizer (if approved by your school or club) in the absence of soap and clean water.
Wash your hands after using shared equipment (such as barbells and free weights).
Use a clean towel as a barrier between your bare skin and shared surfaces (for example, exercise equipment, sauna benches, or physical therapy tables and equipment).
Avoid contact with others' lesions and possibly contaminated items (for example, bandages, towels, or gear).
Wash your hands after contact with others' potentially infectious wounds, skin, or soiled bandages.
Use your own container of liquid soap (do not share!) and shower before and as soon as possible after EVERY practice, game, or tournament.
Avoid touching your eyes, nose, or mouth with your hands to help prevent the spread of infections.
Do not pick or squeeze skin sores, which can worsen an infection and possibly spread it to others.
Completely and securely cover skin infections that are not contagious (such as eczema) before practice, meets, or games.
Do not share towels, washcloths, soap, razors, toothbrushes, or topical preparations (including deodorants, lotions, ointments, gels, or creams).
Wash towels after each use, using hot water with detergent (and bleach if possible) and dry completely on high heat setting.
Wash and disinfect, as indicated, personal and shared athletic gear and equipment (including wrestling mats).
Launder uniforms and other clothing after every use.
Shower with soap (preferably liquid, not bar, soap) before using whirlpools, cold tubs, steam rooms, or saunas.
Do not use whirlpools, cold tubs, steam rooms, or saunas if sores, scratches, scrapes, or wounds are present anywhere on your body.
Do not share cell phones, beverage containers (such as water bottles or sports drinks), cigarettes, or anything else that touches the lips, enters the mouth, or has contact with an affected skin area.

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Hope this helps!

Washing your self for a start, you could be allergic to some things too