Hello Friend, thanks for reaching out here for help. If you have noticed this as a sudden change recently, then you need to analyze it. In Ayurveda, generally such skin disease are caused by excess heat/fire energy in body. It could be due to the medicine you are take, climate, food habits and many others which is increasing your body heat. Simple Solution is to reduce the heat in your body and follow few home remedies from ayurveda.
Next Steps
You can Consult me online for further evaluation.
Health Tips
Drink plenty of water. Take coconut water. Avoid exposure to sunlight. Reduce sour, spicy and salt.