Which of the following can aggravate acne skin types?

Kelp is known to have high levels of iodine and can potentially aggravate acne-prone skin. Iodine is thought to trigger acne flare-ups in some individuals, particularly in those who are sensitive to its effects. When iodine levels increase in the body, it may lead to an increase in oil production and inflammation in the skin, exacerbating existing acne conditions.

The other options—vitamins, avocados, and cucumbers—are generally considered beneficial for skin health, especially in moderation. Vitamins, particularly vitamins A, C, and E, are vital for skin repair and may help improve acne. Avocados contain healthy fats and nutrients that are good for the skin, and cucumbers are hydrating and soothing. These elements can actively improve skin health rather than contribute to aggravation.