Hello, Thank you for contacting HCM I understand your concern, I am Dr Arun Tank, Infectious Disease Specialist answering your query. No low iron level has nothing to do with the dead black patch of skin. Low iron level causes anemia which may be associated with fatigue, breathless ness, low concentration etc. Your dead dry skin patch is because of some skin disease. AS per your description it looks like psoriasis. But detail can only be known if the visual examination done. I advice you to get your examination done and take the treatment as per the doctors guidance. You can use calamine lotion for skin softening, if you have itching you can use cetrizine under your doctors guidance. Please give good moisturizing to your skin by applying petroleum jelly as it can prevent further happening of such a incident. You can ask for further queries here on bit.ly/DrArun. Thank you, Dr Arun Tank Infectious Disease specialist We wish you a best health at health care magic.