Sometimes Rashes emerges in center of chest. Usually it comes while night. It's slightly itchy and reddish.

Usually it comes while night. It's slightly itchy and reddish. This description sounds like it could be a case of contact dermatitis or eczema. I recommend using an over-the-counter antihistamine like Cetirizine (brand name Zyrtec) to help with the itching. Additionally, applying a hydrocortisone cream like Cortaid to the affected area can help reduce inflammation. Make sure to keep the area clean and dry, and avoid any potential triggers that may be causing the rash. If the rash persists or worsens, it's best to consult with a healthcare professional for further evaluation and management.