First you should be sure it is fungal infection or not. If its sure then you may need some antifungals cream or oral form of medicine or both. Personal hygiene is the important aspect of its management as it is easily transferred from the infected person to healthy person by contact. You need to get opinion from dermatologist to be sure and take medicines. For online consultation with dermatologist via hamrodoctor, visit this link: https://www.hamrodoctor.com/service/dermatology