I sliced my pointer finger ( tip) pretty deep now when i extend my arm feels lik!

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If you are concerned about what is going on you should see a doctor about it. Most such injuries will heal on their own as long as you keep them clean and prevent infection. If you think your injury needs stitches you should see a doctor. If it does not need stitches using a butterfly bandaid will help hold the sides of the injury together for healing.

Clean the area with an antiseptic such as alcohol or hydrogen peroxide. Apply a little antibiotic ointment and the bandaid.