What you describe could be
infectiousInfectious endocarditis
Infectious mononucleosis
Infectious mononucleosis #3, allergic or irritant as a result of contaminated shower water. Before it can be treated effectively, the cause must be identified. This will require microscopic examination and culture of the 'pus' you describe. Infections acquired in this fashion are often caused by uncommon organisms such as Legionella, the cause of Legionnaires Disease or
fungiFungi-guard
Fungi-nail or organisms that resemble tuberculosis, called atypical or nontuberculous mycobacteria.
Your best bet would be to see an internal medicine doctor or a specialist in infectious disease, and to do so without delay.