The baby is two months old; what does it mean if there is redness under the arms?

When the baby is two months old, red marks may appear under the arms, which could be caused by several reasons: first, it could be a natural physiological phenomenon because the baby’s skin is delicate and the subcutaneous fat is thin, making it susceptible to external stimuli that cause local blood vessel dilation and redness. Usually, no special treatment is needed, and it will improve on its own over time. Secondly, it could be eczema, which is related to genetics or a humid environment, manifesting as papules, blisters, and possibly itching or pain, with more prominent symptoms after scratching. In this case, a doctor may recommend using calamine lotion for washing or applying zinc oxide ointment to expedite recovery. Furthermore, prickly heat is also a common cause, resulting from sweat gland blockage, especially in hot seasons, leading to small bumps accompanied by stinging and burning sensations, affecting sleep. For treatment, creams like hydrocortisone and mometasone furoate may be used as directed by a doctor. Additionally, this condition could also be due to other health issues like allergic purpura, requiring a visit to the hospital for examination and targeted treatment. Maintaining the baby’s personal hygiene, bathing regularly, ensuring fresh indoor air, are all crucial for preventing such skin problems.