You are likely experiencing a common and harmless skin condition called dermatographia, often referred to as skin writing. It occurs when light pressure causes your skin cells to release histamine, leading to temporarily raised red welts. To help manage this, you can use over-the-counter daily antihistamines such as cetirizine, loratadine, or fexofenadine, which block the swelling and itching. It is also helpful to wear loose clothing, avoid scratching, and keep your skin moisturised. This condition is not dangerous, but if it persists or bothers you, please consult a doctor for a personalised plan.

For immediate relief from a runny nose, over-the-counter antihistamines like Cetirizine or Loratadine can help, along with saline nasal sprays to clear congestion. However, because your symptoms are recurrent, they may be caused by allergies (allergic rhinitis) or chronic sinusitis rather than repeated common colds. I highly recommend consulting a doctor or allergist for a proper diagnosis. Avoid using over-the-counter decongestant nasal sprays for more than three consecutive days, as they can cause rebound congestion. A healthcare professional can help identify the root cause and prescribe targeted treatment.