Going back to Nigeria before ending date of my permesso di sorgiorno?

good day everyone. please I need an urgent answer to my message. i have been livening in Italy from 3years and 5month now and I have the permesso di sorgiorno. i am not filling too fine i have gone every hospital here in Italy verona, I have not found any solution to my problem, my nest option is too go to Nigeria and take care of my self and come back. and my permesso di sorgiorno is left 2 months to exspire, can I go and also come back before the ending date?

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