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Hello, my name is***** I am a qualified MD with 18 years’ experience and I am happy to work with you on this.
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Do you mean the red rash on the neck?
How long have you had this?
Does it itch?
This is very likely to be ‘Ringworm’, or a fungal infection of the skin.
You should use a clotrimazole cream or topical ointment. Some brand names for this are: Clotrimaderm, Lotrimin, 1% clotrimazole cream. You can ask for topical creams containing clotrimazole at any pharmacy. You need to apply it twice a day for at least a month.If there is severe itching, you can take Tab. Alavert 10 mg once daily(OTC).Also, keep the area dry. This is important as it falls on a skin crease.
If it persists after three weeks of using this, or it increases in size or symptoms during this period, show your doctor, preferably a dermatologist, for this.
Other possibilities are eczema and intertrigous eczema, due to rubbing of the skin. But most likely is a fungal infection and you should treat it as such initially.
Ok, but those are not related to the rash. Pounding heart is called palpitation, it is often related to health anxiety. You should go for a full checkup with your doctor.
Glad to help