Why is this the answer?

The answer is thorn because this clever riddle uses secret clues to describe the tiny, sharp spike found on the stem of a beautiful plant, like a rosebush. Riddles are fun because they make you think about ordinary objects in a surprising new way. Let us look at each line to see how it points to the correct answer. The first clue says, "Soft and fragile is my skin." This clue is a little bit of a trick. It is talking about the whole plant that the thorn belongs to, not just the sharp point. Think about the petals of a rose or the plant’s leaves. They are very soft and fragile, which means they can be easily damaged or torn. The plant has these delicate parts, but it also has a strong protector. The next line tells you, "I get my growth in mud." This is a perfect match. Roses and other plants that have thorns start as a small seed and grow big and tall right out of the soil. That dark, wet dirt gives the plant everything it needs to grow its leaves, its flowers, and its thorns. The riddle continues by saying, "I’m dangerous as much as pretty." A rose is world-famous for being one of the most beautiful flowers because of its bright colors and sweet smell. That is the "pretty" part. The "dangerous" part is the thorn. Plants need to protect themselves from animals like deer or other creatures that might want to munch on their yummy leaves. The sharp, prickly thorn is the plant's special defense shield. Finally, the riddle gives the best hint: "for if not careful, I draw blood." To "draw blood" simply means to cause a little cut or scratch. If you reach for a lovely rose too fast, or if you grab the stem without looking, the sharp thorn will gently poke your finger. It is a tiny warning from the plant to be careful. The thorn is the plant's way of saying, "Look, but don’t touch." This is why a thorn is both pretty, because of the flower it guards, and dangerous.