
Suggest Remedies For A Large Painful Lump On The Arm

Might be contact dermatitis, calamine lotion, oral antihistamine
Detailed Answer:
Hi
Welcome
I have gone through your query and pictures.
Based on the history i think it is contact dermatitis or insect bite.
Presently I would suggest you to wash the area with lots of water and use dermadew soap. Apply calamine lotion with alovera to the affected area. You can also consider taking oral anti histamine which will be helpful. These drugs are available as over the counter medication.
If this doesn't help, Corticosteroid skin creams or ointments may reduce inflammation. Overuse, even of low-strength over-the-counter products, may cause a skin condition should be used with caution.
I would suggest you to follow the measures, if it doesn't help or if it spreads I would suggest you to see doctor for further help.
Hope this helps
Take care

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