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Here are the clues and answers for the crossword puzzle:

Across:

1. POISONING (The process of losing blood from the body - incorrect answer)
2. SCAR (A blue, brown or purple mark that appears on the skin - bruise)
3. RASH (An area of red spots on a person's skin, caused by an illness or reaction)

Down:

1. PAIN (A continuous pain in the back)
2. COUGH (A medical condition where a person has a temperature - fever)
3. STOMACH (The pain in the part of the body which is in the centre of your chest - incorrect answer)
4. HEADACHE (The feeling that you have when you want to vomit - nausea)
5. ITCHING (An uncomfortable feeling on your skin that makes you want to scratch yourself)
6. DIZZY (A feeling as if everything is spinning around you)

Let me know if you need further assistance!