I'm sorry to hear about the discomfort you're experiencing with itching, dandruff, and a fungal infection causing lightened skin on your back, chest, and arms. These symptoms suggest a possible fungal skin infection, which can sometimes cause changes in skin color and irritation.

A commonly used topical treatment for fungal infections is a lotion containing antifungal agents, such as the Konaz ZP Lotion. This lotion is applied directly to the affected areas and can help reduce fungal growth and relieve symptoms like itching and scaling.

However, it is important to get a proper evaluation from a dermatologist (skin specialist) to confirm the diagnosis and receive personalized treatment advice. They can also rule out other causes of skin discoloration and itching and recommend the most effective treatment plan.

Recommendations:

• Avoid scratching the affected areas to prevent further irritation or secondary infection.
• Keep the skin clean and dry.
• Consult a dermatologist promptly for an accurate diagnosis and appropriate treatment.
• Follow the dermatologist’s instructions carefully if prescribed any topical or oral medications.

If symptoms worsen or you notice spreading, pain, or signs of infection like pus or fever, seek medical attention immediately.To narrow down potential causes, we will need some more information.I understand you're dealing with skin issues like itching, dandruff, and a fungal infection. To better assist you, could you please share your age and gender?