Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain it seems that sores on my chin and in my neck with pain. they are itchy some times can be due to hair follicle infection or folliculitis that can occur due to bacterial infection.. It can also be due to contact dermatitis caused due to allergic reaction with any of the creams, soaps etc used at the barber s shop.. Nothing to worry, you can take anti allergics like levocetrizine and also do cool compresses over the sores.. You can also apply calamine lotion and antibiotic ointment.. For dark spots you can apply cream containing Vitamin E and Kojic acid and exfoliate your skin with a gentle scrub weekly to remove dark spots.. If there is no improvement consult a Dermatologist and get evaluated.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.