Do plasters for sprains work?

Sprain in traditional Chinese medicine belongs to the category of injuries, mostly in the joints, the use of some through the meridians and pain creams have a certain effect on pain, such as sprain cream, Shennong analgesic cream, pain paste paste and so on.
1. Sprain cream: efficacy is to warm the cold, through the pain for joint sprain and contusion. Adverse reactions and contraindications are not clear.
2. Shennong Pain Relieving Paste: Its effect is to activate blood circulation, dissipate blood stasis, reduce swelling and relieve pain, used for bruises, rheumatic arthralgia, lumbar and back pain. The use of itchy skin, rash and other allergic reactions, pregnant women are prohibited.
3. Pain Relieving Paste: It is effective in activating blood circulation and removing blood stasis, relieving swelling and pain, and is used for acute and chronic sprain and contusion, bruise, osteoarthritis, rheumatism and rheumatoid pain, pillow, frozen shoulder, lumbar muscle strain and old injury.
Allergic patients may have adhesive tape allergy or drug contact itching reaction, such as itching, redness, swelling, blisters, hyperpigmentation. Use with caution in pregnant women, open wounds are contraindicated.
The use of plasters must be carried out in accordance with the doctor’s instructions, and should not be used arbitrarily without authorization, so as not to aggravate the condition.