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It would have helped more if you would have mentioned your age.
Shrunken,discoloured and swollen toe pad with pain can be because of dry gangrene caused due to
peripheral vascular disease or neuroloical disease due to
alcohol abuse.
The other less likely possibility can be
fungal infection of skin.
It needs to be evaluated by detailed physical examination by
general surgeon.
Certain basic investigations need to be done like fasting blood glucose,
blood lipids,Colour doppler peripheral blood flow.
Also certain medications may predispose to this condition.
Keep the area clean and dry.
Wear shoes with adequate space for toes.
Further management depends upon the diagnosis.
Hope I answered your query.
Feel free to ask any more doubt.