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If you have developed rash
after taking the hcg
drops it may be possible that you are allergic to any of the ingredient.Please consult a doctor for examination and treatment for the rash and after taking anti allergic it should go away but for the spotting since you are post menopause
it is necessary to investigate and get examined as it may be a hormonal
issue or may be some other reason for which consult a Gynaecologist.