Dictionary / Vocabulary / 肥厚
ひこう
thickening (of organic tissue, e.g. skin); hypertrophy
刺激を受け続けると肌の保護作用により角質が肥厚して、ゴワゴワしたり硬くなって、毛穴が目立ってきます。
If it continues to be stimulated the skin's protective function causes thickening and it becomes stiff and hard with pores that stand out.