Welcome to Healthcare Magic Forum
You seem to have developed a superficial wound over your finger,,,Usually if the lesion is not that deep , then proper cleaning of the lesion just suffices..
As you are having itching over the affected area, then this is usually considered a good sign,,As in any kind of wounds, itching develops when the lesions are in the healing phase,,,
But avoid touching it too much...Avoid using any kind of cold
dreams or hair oils..as it might increase the lesion..You can start using a topical antibiotic/antiseptic cream like mupirocin
gel over the area for 2-3 days
Now , as far as the fatigue
and weakness is concerned, such lesions can lead to constitutional symptoms only if the lesions are really infected or have developed into deep infections,,Which seems unlikely in your case. So , maybe you can visit a general physician for these symptoms..
Hope it helps
Dr Geetika paul