The spelling of the word "Pusy skin disease" may seem unusual, but it can be explained through phonetics. The correct spelling of this word is "pustular" skin disease, which is pronounced /ˈpʌs.tʃə.lər/ in IPA transcription. The word "pustular" refers to a group of skin diseases that cause itchy bumps, blisters, or pustules to form on the skin. It is important to use proper spelling and pronunciation when discussing medical conditions to avoid confusion and ensure accurate diagnoses and treatments.