It's important to consult with your physician or dermatologist before beginning any new treatment, especially given your medical history of lymph node removal. Both the Dermapen and Dermaroller are microneedling devices designed to promote skin rejuvenation. They can be used on various parts of the body, including the arms. However, they work by creating small injuries in the skin, which stimulates the body's healing response and promotes collagen production. Given your history of lymph node removal, there may be a risk of lymphedema, a condition characterized by swelling due to a blockage in the lymphatic system. Microneedling could potentially exacerbate this condition, so it's essential to discuss this with your healthcare provider. Your age and skin type may also affect the outcome of the treatment. Fair skin is typically more sensitive and may be more prone to redness or irritation following microneedling. In conclusion, while microneedling can potentially improve skin texture and tone, it's crucial to discuss these factors with a professional who can assess your individual health status and provide personalized advice.