What could be the reason for the red patches on the chest, back, and arms?

Hello,

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It seems you have truncal acne. Acne vulgaris is a common skin problem in adolescents and in adulthood it involves pilosebaceous follicles or oil glands and is therefore seen to involve areas where oil glands are dense like the face, chest, back, and upper arms are common sites of involvement. You have to do certain dietary restrictions like not taking oily spicy food, junk food, milk products, and nonvegetarian foods using lots of water which hydrates your skin. You should start with the tablet Azithromycin 500 mg once daily for three consecutive days in a week for three weeks. Along with this take a capsule of Isotretinoin 20 mg once daily and apply Benzoyl peroxide 10 % gel on the pimples twice daily for six weeks. You should use Perobar 5 % soap for bathing. Besides this keep your back dry. Follow some skin care tips such as avoiding applying cream and moisturizer, avoiding wearing tight clothes, and reducing the intake of sugary foods. Before starting the oral medication get the following tests done. Liver function tests and lipid profile. If these come normal you can start with capsule Isotretinoin after consulting your doctor or near by dermatologist and revert back after six weeks as acne is a chronic disease and will take time to resolve.

I hope this has helped you. Thank you.