Some designs warm parts of the cabinet to manage condensation or reject heat. Check the model's description before treating ordinary warmth as a fault.
What the observation tells you
Touch does not quantify temperature or distinguish normal operation from overheating. Burning smells, discolouration or damaged electrical fittings are different warning signs. Do not cover the area with insulation or add a fan as an improvised repair.
A useful next step
Keep required ventilation clear and describe where the warmth occurs and whether it has changed. Seek qualified help for concerning heat or electrical signs rather than continuing repeated touch tests.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.