Painful shoulders and swollen skin may mean you need treatment. However, the reason may be simple, for example, sunburn may be self-healing. Other situations that may be unrelated may lead to the symptoms. Please consult your doctor for diagnosis and proper treatment.

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Parvovirus Infection
Parvovirus Infection is a highly infectious disease that usually affects children but may develop in adults. A scarlet rash on the face, probably from the shoulder to the arm, or from the trunk to the buttocks, is the most distant feature of this condition. This rash is rare in adults, but joint pain is common - although shoulders are less frequent than wrists, ankles, knees and hands. Parvovirus usually requires very little treatment. The Mayo Clinic recommends that parvovirus infection may be more severe for pregnant women, people with weak immune systems and people with anemia.
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Sunburn
Severe sunburn can cause redness of your skin, pain in your shoulders or anywhere exposed to sunlight. Your skin may be red, soft, or even warm. Red skin develops into blisters in a few hours or days. In a few days, the skin may peel off. According to the National Library of Medicine, chills, nausea, fever and rashes may indicate solar poisoning, which is a serious response to sunburn. Drug therapy can also explain shoulder pain and skin redness. Lexus drugs, for example, can cause neck and shoulder pain and rashes, according to Drug.com. The drug can cause some related musculoskeletal and skin side effects, such as muscle stiffness, spasm, acne and dry skin. Ask your doctor if any medication you are taking can cause side effects.
h3>Lyme diseaseIf ticks bite your shoulder, you may suffer from Lyme disease, also known as leptospirosis or leptospirosis, which causes redness and pain around the bite. Symptoms described by NetDoctor include skin changes, joint pain, muscle pain, sleepiness, fever, lymphadenopathy and headache. Red rings usually appear around the mild spots where bites occur; over time, red rings may spread.