Each pathogen has a different way of invading the skin and hence, the skin lesions will look different. Underlying health conditions such as diabetes, skin allergies, cancers affect the immunity of the skin and can make these patients vulnerable to infections.
Treatment depends entirely on the pathogen causing the rash. Sometimes, there may be a mixed infection, in which case more than one treatment approach is necessary. Skin and lab tests may sometimes be required if the diagnosis isn’t clear or when the initial treatment isn’t working. In milder cases, treatment with creams and ointments may suffice but in most extensive cases, oral and injectable medications may be required. Surgical interventions are important when the infection is extensive and in areas where systemic medications can’t reach well. (Eg. Drainage of an abscess)