回答
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In winter my skin gets badly cracked so hand cream is indispensable.
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During winter my skin gets really cracked so I have to use hand cream.
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In winter my hands get really chapped so I rely on hand cream.
日本の冬は特に空気が乾燥しますよね。
冬場 = winter; winter season
皹=あかぎれ=cracked skin; split skin; chaps
手の皹 = chapped hands (例 my hands get chapped)
欠かせない= vital; indispensable
I have to use = 使わなければならない
I rely on 〜 = 〇〇 に頼る