What can cause sudden tingling and itchy sensation?

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It is a case of folliculitis, probably fungal or bacterial in nature. Apply Mupirocin ointment, twice daily.

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By looking at lesion (attachment removed to protect patient identity) it is a clear cut case of folliculitis.

If itching is there, then there are two most common cause, scabies and Malassezia folliculitis. Scabies is a common cause of folliculitis secondary to itching. Itching predominantly occurs at night, webs of fingers and abdomen are usually affected. Family members or roommates could also be affected. Permethrin 5 percent lotion, twice a week apart is the treatment of choice.

Malassezia folliculitis, mainly on the back and is associated with itching. Ketoconazole 200 mg daily for 21 days and Ketoconazole cream, locally twice application the treatment of choice. Now bacterial folliculitis, usually do not present with itching but since bacterial coinfection is quite common usually antibacterial like Mupirocin is commonly given. Folliculitis with itching can also be one of presenting complaint of diabetes, so if not responding to any medications, please do check your blood sugar levels.

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It can be sometimes due to autonomic neuropathy. Although the diagnosis of it can be made only after ruling out other conditions, sometimes deficiency like vitamin B12 also presents like this. You need to refer a good physician because as a teledermatologist I can only comment on what is visible. A complete physical examination is needed to rule out other systemic conditions which can mimic like yours. Nevertheless, go for vitamin B12 replacement for 3 to 4 weeks.